package com.atguigu.gulimall.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.constant.EsConstant;
import com.atguigu.gulimall.feign.ProductFeignService;
import com.atguigu.gulimall.service.MallSearchService;
import com.atguigu.gulimall.vo.AttrResponseVo;
import com.atguigu.gulimall.vo.BrandVo;
import com.atguigu.gulimall.vo.SearchParam;
import com.atguigu.gulimall.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.expression.spel.ast.Literal;
import org.springframework.stereotype.Service;
import org.elasticsearch.search.sort.SortOrder;
import org.w3c.dom.stylesheets.LinkStyle;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service("MallSearchServiceImpl")
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    //去ES进行检索
    @Override
    public SearchResult search(SearchParam param) {
        //1、动态构建出查询需要的DQL语句
        SearchResult result = null;

        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            result = buildSearchResult(response,param);

            

        }catch (IOException e){
            e.printStackTrace();
        }
        return result;
    }

    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {

        SearchResult result = new SearchResult();

        SearchHits hits = response.getHits();

        /**
         * 1、返回的所有查询到的商品
         * 2、当前所有商品涉及到的所有属性信息
         * 3、当前所有商品涉及到的所有品牌信息
         * 4、当前所有商品涉及到的所有分类信息
         * 5、分页信息
         *     5.1页码
         *     5.2总记录数
         *     5.3总页码
         */
        //1、返回的所有查询到的商品
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits()!=null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);


        //2、当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //TODO 2、得到属性的名字
            String attrName = ((ParsedStringTerms)bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //TODO 3、得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms)bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item->{
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌id
            long brandId = bucket.getKeyAsNumber().longValue();
            //TODO 2、得到品牌的名字
            String brandName = ((ParsedStringTerms)bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            //TODO 3、得到品牌的图片
            String brandImg = ((ParsedStringTerms)bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }

        result.setBrands(brandVos);


        //4、当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();

        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");

            //TODO 为什么是get(0)?  es的数据就是这样封装的
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);


        //5、分页信息
        //页码
        result.setPageNum(param.getPageNum());
        //总记录数
        Long total = hits.getTotalHits().value;
        result.setTotal(total);
        //总页码
        long totalPages = total % EsConstant.PRODUCT_PAGESIZE == 0 ? total / EsConstant.PRODUCT_PAGESIZE : (total / EsConstant.PRODUCT_PAGESIZE) + 1;
        result.setTotalPages((int) totalPages);


        //添加一个辅助数组，实现页面页数的遍历
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);


        //6、构建面包屑导航功能
        if(param.getAttrs() != null && param.getAttrs().size() > 0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //1、分析每个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                //attrs=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = (AttrResponseVo) r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }
                //2、取消这个面包屑以后，我们要跳转到哪个地方,将请求地址的url里面的当前置空
                //拿到所有的查询条件、去掉当前条件
                //attrs=  15_海斯(Hisilicon)
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }

        /**
         * todo 品牌获取
         */
        if(param.getBrandId()!=null && param.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();

            navVo.setNavName("品牌");

            //远程调用，品牌获取
            R r1 = productFeignService.brandsInfo(param.getBrandId());
            if(r1.getCode() == 0){
                List<BrandVo> brand = (List<BrandVo>) r1.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String res = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName()+";");
                    res = replaceQueryString(param,brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+res);
            }
            navs.add(navVo);
        }



        return result;
    }

    private static String replaceQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value,"UTF-8");
            encode = encode.replace("+","%20");//浏览器对空格编码和java不一样
        }catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        // TODO
        String replace = param.get_queryString().replace("&"+key+"="+encode, "");
        return replace;
    }

    /**
     * 准备检索请求
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         * 查询：过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1、构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        //1.1、must-模糊匹配
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2、bool- filter 按照三级分类id查询
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.3、bool- filter 按照品牌id查询
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        //1.4 bool-filter 按照库存是否有进行查询
        if(param.hasStock !=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() != null && param.getHasStock() == 1));
        }

        //1.5 bool-filter 按照价格区间
        if(!StringUtils.isEmpty(param.getSkuPrice())){

            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");

            if(s.length == 2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                //小于等于
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //1.6 bool-filter - 按照所有指定的属性进行查询
        if(param.getAttrs() != null && param.getAttrs().size()>0){
            for (String attrStr : param.getAttrs()) {
                //attrs=1_5寸:8寸&attrs=2_16G:8G
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));

                //TODO 每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1排序
        if(!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

        //2.2分页 TODO EsConstant.PRODUCT_PAGESIZE
        sourceBuilder.from((int) ((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE));
        sourceBuilder.size(Math.toIntExact(EsConstant.PRODUCT_PAGESIZE));

        //2.3高亮
        if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }


        /**
         * 聚合分析
         */
        //1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(50));
        sourceBuilder.aggregation(brand_agg);

        //2、分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(50));
        sourceBuilder.aggregation(catalog_agg);

        //3、属性聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        //聚合分析出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(50);

        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(50));

        //聚合分析出当前attr_id对用的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);


        System.out.println("构建的DSL语句："+sourceBuilder.toString());

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }
}
